Low noise HTS dc-SQUID flip-chip magnetometers and gradiometers

作者：Michael I. Faley, U. Poppe, Knut W. Urban, Douglas N. Paulson, Tatiana Starr, Robert L. Fagaly · 发表于：IEEE Transactions on Applied Superconductivity · 年份：2001 · DOI：10.1109/77.919609 · 被引用次数：54 · 研究领域：Magnetic Field Sensors Techniques、Geomagnetism and Paleomagnetism Studies、Physics of Superconductivity and Magnetism

We have fabricated HTS dc-SQUID flip-chip sensors with a large area multilayer flux transformers. Different layouts of the flux transformers provide a large variety of magnetometers and planar gradiometers. For the magnetometers a resolution /spl sim/6 fT//spl radic/Hz and the planar gradiometers a resolution of about /spl sim/30 fT/cm./spl radic/Hz were routinely obtained at 77 K. The noise was nearly white down to frequencies of few Hz. The sensors were vacuum-tight encapsulated together with a heater and a feedback coil. This makes the handling of the sensors more reproducible and convenient. Production of the magnetometers and gradiometers in small series was proven.